STEEL SEAL HEAD GASKET SEALER,MCP,USED 4 CYLINDERS,Engine Sealer,cracked heads, head gasket failures, cracked blocks, radiators, heater cores and water pumps. (4 Cylinders( Used one Bottle ),(6 & 8 Cylinders (Used 2 Bottles) Permanently Seals:Cracked Cylinder Heads,Blown Head Gaskets, All Block Leaks. Permanently Seals: Works On: Cracked Cylinder Heads Gasoline and Diesel Engines Blown Head Gaskets Cast Iron or Aluminum Blocks & Heads Intake Gasket Leaks MLS - Multi Layer Steel Gasket All Block Leaks Copper Head Gaskets Other Severe Coolant Leaks Composite Head Gaskets HOW TO USE ? 1: Simple Method. Keep the antifreeze;-- 2. Start the engine and let it up before the Engine Seal is added. Then remove the radiator cap and add the amount of liquid Engine Seal you have calculated. The engine continues to run until the leak is sealed. Engine Sealer,MCP, fixes permanent leaks in all types of water cooled engine including cracked heads, head gasket failures, cracked blocks, radiators, heater cores and water pumps. PLEASE , IF YOU ARE NOT HAPPY CONTACT US;